We have a 1999 Winne 37' coach. The engine is a Ford V-10. My situation is when we run the AC, it blows through the defrost vents at the windshield. I have selected the different positions on the swit...
The vacuum HVAC controls on our 2001 F53 quit a coupe of years ago, defaulting to just the defrosters as it should. I traced the failure to a rotted 2" long hose where the control hose runs to a 'Y' that connects to a vacuum canister located at the outside of the right hand frame rail just ahead of the front wheel. I cut a short section of spare fuel hose as a replacement and the controls are working properly now. I can take a picture of the location if you need it.